The only problem I ever had with Vista is when I turned off the annoying security stuff (i.e. having to confirm when you want to open or install something) only to discover that it actually acts as a conduit to the registry and that any registry calls were not being made, leading to borked installs and wonky software (Office and iTunes were prime examples).
Also, Chrome is currently my default browser of choice for it’s speed and simplicity (I was never big on the FF extensions). If extensions are your thing, though, keep an eye on Chrome as Google are working on an extension platform for it.
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